Bus



FIG. 1 is a front perspective view of a bus in accordance with the present design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a rear perspective view thereof;

FIG. 5 is a left side elevational thereof; and,

FIG. 6 is a right side elevational thereof.

The broken lines depict portions of the bus that form no part of the claimed design. 

CLAIM The ornamental design for a bus, as shown and described. 